Submersible Corrosion-Resistant Pumps

Tsurumi Submersible corrosion-resistant pumps are made of stainless steel (304 or 316) and titanium. Because these materials are used, the pumps can handle chemical fluids of low pH value (e.g., corrosive acidic fluid), as well as seawater.
The corrosion-resistant pumps use highly corrosion-resistant materials for all parts that are exposed to fluids, including the impeller, casing, motor frame, outer cover, strainer stand, bend, flange and sealing parts.

Submersible Corrosion-Resistant Pumps Catalogue Download

Tsurumi puts particular effort into developing submersible pumps made of 316 stainless steel casting. In recent years, polluted water and runoff from mines and quarries have been cited as social problems in many countries, to the point that demand for pumps that can handle these fluids has been increasing year by year. In fact, more than 40% of the runoff from mines is strongly acidic with a pH value of less than 4. To meet this application, Tsurumi has aggressively continued development of all stainless steel pumps that are made of 316 stainless steel casting.
Because they are made of stainless steel casting, the pumps are resistant to wastewater containing abrasive substances, as well as corrosive fluids. That is, these pumps deliver the durability needed in harsh fields where pumps made of aluminium, stainless steel and cast iron suffer damage in a matter of weeks, if not days. More specifically, principal parts of the LH/LH-W-14 and SFQ series are made of 316 stainless steel casting, which considerably improves product reliability in comparison with stainless steel in applications involving heavy-duty work. Therefore, Tsurumi’s stainless steel pumps can serve in harsh environments such as mines and quarries, as well as in chemical plants and wastewater treatment plants, thus covering a wide range of applications.

Furthermore, Tsurumi offers seawater pumps that use titanium for parts exposed to fluids. The combination of resin and titanium enables a lightweight compact design that is the most suitable for handling seawater.
Tsurumi continues its research so as to handle a variety of fluids.

Submersible Corrosion-Resistant Pumps Lineup

  • LH-14
  • LH-W-14
  • SQ
  • SFQ_construction
  • TM

Suitable for harsh environments such as mines and quarries, as well as in chemical plants, wastewater treatment plants and seawater applications.

Selection Table

  Corrosive Liquids Seawater
LH-14 LH-W-14 SQ2 SFQ TM
Discharge Bore (mm) 100 - 200 80 40 ・ 50 50 ・ 80 40 - 80
Motor Output (kW) 22 - 110 11 ・ 22 0.25 - 0.75 0.4 - 11 0.25 - 3.7
Top Discharge,
Side Discharge      
Major Wetted Parts 316 Stainless
Steel Casting
316 Stainless
Steel Casting
304/316 Stainless Steel and Resin 316 Stainless
Steel Casting
Titanium and Resin
Rubber Parts FPM (FKM) FPM (FKM) Nitrile
Butadiene Rubber
FPM (FKM) Nitrile
Butadiene Rubber
Automatic Operation    
(Single-phase only)
Guide Rail Fitting System        

In addition to the target models, Tsurumi's standard material pumps can be made of stainless steel as an option.
To request this option, contact your dealer.

pH Values and Corrosion Resistance of Each Material

pH Values and Corrosion Resistance of Each Material

The above data is a rough indication for sulfuric acid (H2SO4) and sodium hydroxide (NaOH).
The acceptable pH of the whole pump is affected by the type of acid/alkali, seal material, painting, and abrasive environment.

Seawater-Resistant Pumps

Tsurumi's standard pumps can be combined with a seawater-resistant kit (optional) that features a "galvanic anode" and "seawater-resistant special cast iron impeller," for use as submersible seawater-resistant pumps. These pumps have been designed for an expected service life of about two years. (The service life depends on operating conditions.)

Seawater-Resistant Pumps